Chaplin & Keaton as Rivals Part 1

This is a great documentary about the rivalry and a comparison between two of the three top comedians of the silent era, the third being Harold Lloyd.  I, of course, favor Chaplin for the depth of and pathos in his humor, but Keaton and Lloyd were funny in a more slapstick fashion.  Keaton used more advance cinematic techniques than Chaplin, but did not really explore humor the way Chaplin did.  Lloyd was in the thrill humor business.